that stays with you all day to help you quit. in studies, 44% of chantix users were quit during weeks 9 to 12 of treatment, compared to 18% on sugar pill. it's proven to reduce the urge to smoke. ask your doctor if chantix is right for you. and find out how you can save money on your prescription at chantix.com. some people have had changes in behavior, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. if you notice agitation, hostility, depression or changes in behavior, thinking or mood that are not typical for you, or if you develop suicidal thoughts or actions, stop taking chantix and call your doctor right away. talk to your doctor about any history of depression or other mental health problems, which can get worse while taking chantix. some people can have allergic or serious skin reactions to chantix, some of which can be life threatening. if you notice swelling of face, mouth, throat or a rash stop taking chantix and see your doctor right away. do not take chantix if you've had a serious allergic or skin reaction to chantix. tell your doctor which medicines you're taking as they may work differently when you quit smoking. chantix dosing may be different if you have kidney problems.